We studied the effect of iron addition on particle export in the Southern Ocean by measuring changes in the distribution of thorium-234 during a 4 week Fe enrichment experiment conducted in the high-silicate high-nitrate ...

Iron-oxide coated sediment particles in subterranean estuaries can act as a geochemical barrier (“iron curtain”) for various chemical species in groundwater (e.g. phosphate), thus limiting their discharge to coastal waters. ...

Metalloenzymes such as the superoxide dismutases (SODs) form part of a defense mechanism that helps protect obligate and facultative aerobic organisms from oxygen toxicity and damage. Here, we report the presence in the ...

Biological activity has shaped the surface of the earth in numerous ways, but life’s most
pervasive and persistent global impact has been the secular oxidation of the surface
environment. Through primary production – the ...

Salt pond is a meromictic system with an outlet to the sea allowing denser seawater to
occupy the monimolimnion while the mixolimnion has relatively low salinity and is the site of
greater mixing and microbial activity. ...

Polychlorinated biphenyls (PCBs) were used as model hydrophobic organic compounds
(HOC) to study physical~chemical processes which affect the speciation
and fate of HOC in coastal environments. The focus of this study ...

The focus of this thesis is on rates of transport of metals both across
the sediment/water interface and within the sediment column of nearshore
sediments. The early diagenesis of several first-row transition metals
exhibiting ...

A procedure is described for the collection of remote marine aerosol samples by high-volume filtration, cascade impaction, dry fallout collection and rain.
Samples were analyzed quantitatively for five classes of naturally ...